Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Oh in that case I stand corrected. I wouldn't fancy risking it though.
Me neither!
OP, if you're trying to decide what to buy. Just get a 1080 and by the time you start to notice your fps decreasing, you could always pick up another second hand or what not.
You wouldn't be using 980ti drivers the nVidia driver is a unified package that has different components for all the different cards.